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Compounding Pattern of REE, Clay and Humic Acid in the Weathering Crust of Granites 认领 引用 被引量：4
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作者 陈炳辉 陈志澄 +3 位作者 梁群优 符群策 俞受鋆 张丽洁 《Journal of Rare Earths》 SCIE EI CAS 1996年第1期47-53,共7页
An anomalous phase containing clays and humic acid was found while extraction humic acid from samples of weathering crust of REE-bearing granites by using 0.1 mol/L NaOH solution.Studied by chemical separation experim... An anomalous phase containing clays and humic acid was found while extraction humic acid from samples of weathering crust of REE-bearing granites by using 0.1 mol/L NaOH solution.Studied by chemical separation experiments,column chromatography,ion-exchange chromatography,infrared spectrum.fluorescence spectrum,polarimicroscopic testing and elemental determination by ultraviolet-visible spectrometer and atomic absorption spectrometer.it was proved to be a compound of humic acid and clays which are connected in the form of bridge by heteronuclearpolynuclear complexing ions formed by cations of RE￣(5+),Al￣(3+).Fe￣(3+) etc.The compounding pattern was further proved by the experiment for compounding humic acid,REE and kaolinite. 展开更多
关键词 REE Clays Humic acid Compounding pattern Weathering crust of granites
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Novel Method for Preparation of Polypropylene Blends with High Melt Strength by Reactive Compounding 认领 引用 被引量：2
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作者 LIU Yu-guang HUANG Yu-dong +2 位作者 ZHANG Cheng-wu HOU Jing ZHANG Xue-quan 《Chemical Research in Chinese Universities》 SCIE CAS 2009年第4期569-572,共4页
Ultrafine full-vulcanized polybutadiene rubber（UFBR） with particle sizes of ca.50―100 nm were used for modifying mechanical and processing performances of polypropylene（PP） with PP-g-maleic anhydride（PP-g-MA） a... Ultrafine full-vulcanized polybutadiene rubber（UFBR） with particle sizes of ca.50―100 nm were used for modifying mechanical and processing performances of polypropylene（PP） with PP-g-maleic anhydride（PP-g-MA） as a compatibilizer for enhancing the interfacial adhesion between the two components.The morphology,dynamical rheology response and mechanical properties of the blends were characterized by means of SEM,rheometer and tensile test,respectively.The results show that the ternary PP/UFBR blends compatibilized with PP-g-MA possess rheological behaviors like highly branched PP,while no obvious strain hardening is observed in its control binary PP/UFBR blends,a low level of PP-g-MA in PP/UFBR blends can even endow the material with rheological characteristics of high melt strength materials like highly branched PP.The enhancement interfacial interaction between the UFBR particles and PP matrix accounting for the rheological behavior of compatibilized blends and effectiveness of PP-g-MA were proposed and proved. 展开更多
关键词 Polypropylene High melt strength Reactive compounding Nanoparticle Rheology
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Optimization of ultrasonic elastography by coded excitation and transmit-side multi-frequency compounding 认领 引用 被引量：1
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作者 张志宏 刘昊霖 +1 位作者 何颖妮 刘东权 《Journal of Central South University》 SCIE EI CAS 2014年第3期1003-1010,共8页
To improve the quality of ultrasonic elastography, by taking the advantage of code excitation and frequency compounding, a transmitting-side multi-frequency with coded excitation for elastography （TFCCE） was propose... To improve the quality of ultrasonic elastography, by taking the advantage of code excitation and frequency compounding, a transmitting-side multi-frequency with coded excitation for elastography （TFCCE） was proposed. TFCCE adopts the chirp signal excitation scheme and strikes a balance in the selection of sub-signal bandwidth, the bandwidth overlap and the number of sub-strain image based on theoretical derivation, so as to further improve the quality of elastic image. Experiments have proved that, compared with the other optimizing methods, the elastographyic signal-to-noise ratio（Re-SN） and contrast-to-noise ratio（Re-CN） are improved significantly with different echo signal-to-noise ratios （ReSN） and attenuation coefficients. When ReSN is 50 dB, compared with short pulse, Rc-SN and Re-CN obtained by TFCCE increase by 53% and 143%, respectively. Moreover, in a deeper investigation （85-95 mm）, the image has lower strain noise and clear details. When the attenuation coefficient is in the range of 0-1 dB/（cm.MHz）, Re-SN and Re-CN obtained by TFCCE can be kept in moderate ranges of 5〈Re-SN〈6.8 and 11.4〈Re-CN〈15.2, respectively. In particular, for higher tissue attenuation, the basic image quality cannot be ensured with short pulse excitation, while mediocre quality strain figure can be obtained by TFCCE. Therefore, the TFCCE technology can effectively improve the elastography quality and can be applied to ultrasonic clinical trials. 展开更多
关键词 ultrasonic elastography coded excitation transmit-side multi-frequency compounding elastographyic signal-to-noise ratio echo signal-to-noise ratio contrast-to-noise ratio
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Effects of Different Compounding of Formulae on Content of Gardenoside in Yin Chen Hao Decoction 认领 引用
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作者 梁光义 曹佩雪 +3 位作者 柴立 冼福荣 李霞 王友京 《Journal of Traditional Chinese Medicine》 2002年第1期55-60,共6页
In order to observe the effects of the ground and intact Zhi Zi (Fructus Gardeniae) and different combinations of the ingredients and refined single Chinese drug granules in Yin Chen Hao Decoction compound prescriptio... In order to observe the effects of the ground and intact Zhi Zi (Fructus Gardeniae) and different combinations of the ingredients and refined single Chinese drug granules in Yin Chen Hao Decoction compound prescription on the contents of gardenoside (an effective component of the prescription), the contents of gardenoside were determined with reversed phase high performance liquid chromatography (HPLC), with acetonitrile-water (15:85) as mobile phase, at wave length 238nm. The results indicated that the gardenoside-decocted-out rates in the decoctions prepared by different combinations of the ingredients with the ground Zhi Zi (Fructus Gardeniae) all were higher significantly than those in the decoction with intact Zhi Zi (Fructus Gardeniae), and generally, different combinations of the ingredients in the decoction had only little effect on the gardenoside-decocted-out rate. 展开更多
关键词 Iridoids Chromatography, High Pressure Liquid Comparative Study Drug Compounding Drugs, Chinese Herbal Pyrans Technology, Pharmaceutical
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Derivation Versus Compounding 认领 引用
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作者 陈雅荃 《海外英语》 2019年第24期117-118,共2页
In English language,affixation is a significant way of forming new words,This essay intends to explore the concepts of two fundamental ways of forming new words,namely,derivation and compounding.They are different in ... In English language,affixation is a significant way of forming new words,This essay intends to explore the concepts of two fundamental ways of forming new words,namely,derivation and compounding.They are different in a lot of cases,yet,it is also argued that there is a clear dividing line between compounding and derivation. 展开更多
关键词 affixation derivation compounding
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Optimization Analysis of Correction Tape Box Compounding Cavity Runner Balance Based on Moldflow 认领 引用
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作者 Hongbing Wang Chunhua Sun 《World Journal of Engineering and Technology》 2020年第1期42-49,共8页
Aiming at the problem of runner unbalance in the compounding cavity of the upper and lower cover of the correction tape box, the plastic injection analysis software Moldflow was used to optimize runner balance. First,... Aiming at the problem of runner unbalance in the compounding cavity of the upper and lower cover of the correction tape box, the plastic injection analysis software Moldflow was used to optimize runner balance. First, the 3D modeling software Proe was used to establish the geometric model of the upper and lower cover of the correction tape box, and introduced into the plastic injection analysis software Moldflow. Secondly, the upper and the lower cover of the correction tape box were meshed and the initial gating system was designed in Moldflow. Filling analysis of the initial scheme of the correction tape box combined cavity showed that the runner of the melt was not balanced in the mold cavity. Finally, the runner balance optimization analysis of the cavities was carried out. Through optimization, the time unbalance rate of the melt in the mold cavity decreased from 28.6% to 0.7%, the pressure unbalance rate decreased from 42.0% to 4.2%, and the pressure distribution in the cavity was more uniform in the whole injection process. 展开更多
关键词 Compounding Cavity Runner Balance Optimization
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A Morphological Compounding Analysis of Hausa Registers Use in Nigerian Cell-phone Market 认领 引用
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作者 Almustapha Wali Sambo 《宏观语言学》 2020年第1期139-150,共12页
This study aims to find the compound registers that are used among the Farm-Centre cell-phone marketers,analyse their compounding morphological structures,and explain the meaning they convey.The Farm-Centre Cell-phone... This study aims to find the compound registers that are used among the Farm-Centre cell-phone marketers,analyse their compounding morphological structures,and explain the meaning they convey.The Farm-Centre Cell-phone Market is located in Kano metropolis,the largest city of Northern Nigeria.The study employs an ethnographic method of data collection and adopts Abubakar(2000)as a model of approach when analysing the structures of the compound registers.It is found that the registers have the following six morphological compound structures:(i)Genitive-based compounds[LG+N]N,(ii)Noun-based compounds[N+GL+N]N,(iii)Adjective-based compounds[Adj+N]N,(iv)Diminutive-based compounds[Dim+N]N,(v)Particle dà‘with’compounds[dà+N]N,(vi)Verb-based compounds[V+VN/Prep]V.Moreover,the registers are so special among the marketers because they convey meanings that are irrelevant to the conventional meanings known by the general speakers of the Hausa language. 展开更多
关键词 Hausa morphology compounding registers meaning Kano Nigeria
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赢创和Compounding Solutions LLC签订了一项医用级聚合物的分销协议 认领 引用
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《环球聚氨酯》 2018年第12期20-20,共1页
赢创公司已与全球领先的定制医疗塑料配制和分销公司Compounding Solutions LLC签署了一项协议,用于销售其VESTAMID?Care ML聚酰胺12, VESTAMID?Care ME聚醚嵌段酰胺(PEBA), TROGAMID?Care clear聚酰胺,和VESTAKEEP?Care PEEK医用级聚合... 赢创公司已与全球领先的定制医疗塑料配制和分销公司Compounding Solutions LLC签署了一项协议,用于销售其VESTAMID?Care ML聚酰胺12, VESTAMID?Care ME聚醚嵌段酰胺(PEBA), TROGAMID?Care clear聚酰胺,和VESTAKEEP?Care PEEK医用级聚合物,在北美临时接触(体内<30天)医疗器械市场上销售。 展开更多
关键词 高性能聚合物 Compounding Solutions LLC 医用级
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A Cognitive Analysis of English N+N Compounding Words From the Perspective of Image Schema 认领 引用
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作者 ZHAN Qi NI Jincheng 《US-China Foreign Language》 2022年第5期199-205,共7页
English N + N compounds, showing a complicated construction of meaning, can be divided into two categories: coordinate compounds and attribute-head compounds. As cognitive linguistics develops, many scholars conduct t... English N + N compounds, showing a complicated construction of meaning, can be divided into two categories: coordinate compounds and attribute-head compounds. As cognitive linguistics develops, many scholars conduct their researches by using cognitive mechanisms like conceptual blending theory and categorization. However, few scholars reveal N + N compounds’ meaning construction mechanism by applying principles of image schema. This study aims to explore the meanings of English compounds from the perspective of image schema. High-frequency coordinate and attribute-head compounds are selected from the Large Database of English Compounds (LADEC), and their meanings are analyzed based on schemas existing among them. It is found that word meaning can be constructed according to its corresponding image schema, and the meaning of a compounding word is closely related to human cognition. This study extends the application range of cognitive linguistics and provides more trains of thoughts to the research related to N + N compounding words. 展开更多
关键词 cognitive analysis English N+N compounds image schema
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Experimental study of POE dope dyeing for solar cell encapsulation films in a cavity transfer mixer 认领 引用
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作者 Zhengming Gao Jia Chen +2 位作者 Zhipeng Li Junhao Wang Ziqi Cai 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2026年第3期295-302,共8页
Dope dyeing technology offers a cost-effective and simple solution for producing colored photovoltaic encapsulation films on a large scale.The dispersion quality of micro amount of pigments is critical for light trans... Dope dyeing technology offers a cost-effective and simple solution for producing colored photovoltaic encapsulation films on a large scale.The dispersion quality of micro amount of pigments is critical for light transmittance and photoelectric conversion efficiency.To achieve the uniform dispersion,mixing performance of pigments using a twin-screw extruder and a cavity transfer mixer(CTM)was comparatively investigated under identical processing conditions.Qualitative analysis was evaluated through electron microscopy of agglomerate and element distribution.Quantitative analysis was evaluated by CIE L*A*B*color space and color difference.The results revealed that CTM-processed samples,under identical conditions,achieved a significantly higher degree of dispersion uniformity.Building on this,the study systematically analyzed the impact of varied operational parameters within the CTM on both mixing and color performance.This provides a crucial foundation and a feasible strategy for developing multi-colored solar encapsulation films with enhanced visual characteristics. 展开更多
关键词 Mixing performance Cavity transfer mixer Polymer compounding Colored PV modules
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Combined volatile metabolome and transcriptome analysis of 60 peach cultivars provide new insights into the formation of aroma and the identification of associated genes 认领 引用 被引量：2
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作者 Wenyi Duan Zhenyu Yao +7 位作者 Chengkui Qiao Junren Meng Shihang Sun Lei Pan Liang Niu Guochao Cui Zhiqiang Wang Wenfang Zeng 《Horticultural Plant Journal》 SCIE CAS CSCD 2026年第5期1025-1038,共14页
Volatile organic compounds(VOCs)are the main chemical compounds that determine the characteristic aroma and flavor of fruit.In this study,we identified a total of 97 VOCs,including 5C6 compounds,12 aldehydes,4 alcohol... Volatile organic compounds(VOCs)are the main chemical compounds that determine the characteristic aroma and flavor of fruit.In this study,we identified a total of 97 VOCs,including 5C6 compounds,12 aldehydes,4 alcohols,10 esters,13 lactones,18 terpenes,8 norisoprenoids,8 ketones,3 hydrocarbons,8 phenylalanine derivates,and 8 other compounds,in 60 peach cultivars using headspace solid-phase microextraction(HS-SPME)combined with gas chromatography-mass spectrophotometry(GC-MS).A wide range of VOCs were detected in these germplasm resources with respect to both quantity and concentration.Correlation analysis with different physiological traits demonstrated that the genetic background exerts a significant influence on the composition and content of VOCs among peach cultivars.For example,the content of norisoprenoid was significantly lower in yellow-fleshed peach than in white-fleshed peach,and lactones were almost undetectable in stony hard peach.Among the 97 VOCs,26 exhibited odor activity values(OAVs)exceeding 1,suggesting that these compounds act as key odorants in the peach VOC composition.Moreover,six structural genes associated with the synthesis of γ-decalactone and(Z)-3-hexenyl acetate and five genes linked to aldehyde and 1-octen-3-one biosynthesis were identified through weighted gene co-expression network analysis(WGCNA).Additionally,15 transcription factors(TFs)were identified as potentially regulating VOC synthesis.Overall,these data provide insight into the factors contributing to the differences in aroma qualities among peach cultivars,which can help to promote the development of peach breeding. 展开更多
关键词 Volatile aroma compounds Peach cultivars OAVs Transcriptome
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Screening of tyrosine phosphatase SHP2(PTPN11)inhibitors from natural products with therapeutic potential for receptor tyrosine kinase-driven cancer 认领 引用 被引量：1
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作者 Lingfeng Chen Di Ke +4 位作者 Zheng Jiang Ruixiang Luo Jie Li Lulu Zheng Guang Liang 《Journal of Pharmaceutical Analysis》 SCIE CAS CSCD 2026年第2期488-499,共12页
Src homology 2 domain-containing phosphatase 2(SHP2)is a pivotal regulator linking receptor tyrosine kinase(RTK)signaling.Abnormal SHP2 activity has been associated with tumorigenesis and metastasis.Although some SHP2... Src homology 2 domain-containing phosphatase 2(SHP2)is a pivotal regulator linking receptor tyrosine kinase(RTK)signaling.Abnormal SHP2 activity has been associated with tumorigenesis and metastasis.Although some SHP2-targeting modulators have entered clinical trials,U.S.Food and Drug Administraction(FDA)-approved SHP2 targeting drugs are still not available.Herein,we describe cooperative biochemical inhibition experiments that facilitate the identification of both catalytic and allosteric SHP2 inhibitors using an in-house natural product(NP)library.Based on this screening methodology,structurally diverse sets of NPs were characterized,among which dihydrotanshinone I(DHT)potently inhibited the wild-type SHP2 protein tyrosine phosphatase(PTP)domain and gain-of-function SHP2 variants.Trichostatin A(TSA)bound to the“tunnel”binding site,acting as an allosteric inhibitor.This study illustrates an optimized screening methodology and tactics to identify novel SHP2 modulators from NPs and provides a foundation for further NP-based drug development for the treatment of RTK-driven cancer. 展开更多
关键词 SHP2 High-throughput screening Lead compound Natural products Allosteric inhibitor
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Algae penetration and taste and odor compounds production in drinking water treatment plants:seasonal variations and risk assessment 认领 引用 被引量：1
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作者 Ya Cheng Caiyun Ma +5 位作者 Gang Wen Chaoyang Zheng Wenle Tian Kailin Sha Xinru Han Tinglin Huang 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2026年第2期319-329,共11页
In the conventional water treatment process,algae have a propensity to breach the filter barriers and potentially seep into the water distribution system,leading to an elevation in taste and odor compounds(T&O com... In the conventional water treatment process,algae have a propensity to breach the filter barriers and potentially seep into the water distribution system,leading to an elevation in taste and odor compounds(T&O compounds).This investigation delved into the seasonal fluctuations of algae penetration and the production of T&O compounds within the treatment units of Reservoir Water Plant 1(W1)and River Water Plant 2(W2).The findings indicated that despite the application of the‘pre-oxidation,coagulation and sedimentation(PCS),sand filtration,and disinfection’process,certain robust-walled filamentous Cyanobacteria,Bacillariophyta species,and small Chlorophyta genera managed to bypass the filters.The leakage of algal cells during autumn at W1 was particularly striking,with a peak of 1,170,000 cells/L.The concurrent assessment of the potential for T&O compound formation revealed an alarming high potential for 2-methylisoborneol(2-MIB)in the water leaving the plants,with concentrations soaring to 197.20 ng/L at W1 in autumn and 54.78 ng/L at W2 in summer.This underscores the significant capacity of residual algal cells to generate T&O compounds.Tracking the retention and penetration dynamics of algal cells across each drinking water treatment stage is crucial for surface water treatment facilities to develop effective operational and management strategies,thereby enhancing the safety and quality of drinking water for the end consumer. 展开更多
关键词 Cyanobacteria Surface water treatment plant Algae penetration Taste and odor compounds 2-Methylisoborneol
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How vehicle and fuel specifications affect evaporative and refuelling emissions from petrol vehicles 认领 引用 被引量：1
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作者 Chunxiao Hao Yunshan Ge +11 位作者 Xin Wang Jindong Liang Peng Chen Hong Bao Jiachen Li Dailin Yin Chongyao Wang Ruonan Li Junfang Wang Jia Ke Qing Liu Hang Yin 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2026年第3期847-857,共11页
Evaporative and refuelling emissions are a major source of volatile organic compound(VOC)contamination,contributing to ground-level ozone formation in China.To meet increasingly stringent evaporative emission control ... Evaporative and refuelling emissions are a major source of volatile organic compound(VOC)contamination,contributing to ground-level ozone formation in China.To meet increasingly stringent evaporative emission control requirements,a growing number of newly certified vehicles have adopted onboard refuelling vapour recovery systems and updated canisters.This study aimed to evaluate the impact of vehicle and fuel specifications on evaporative and refuelling emissions from China-6 light-duty vehicles(LDVs).Two groups of experiments were conducted.In the first group,28 tests were performed on China-6 LDVs and 24 on China-5 LDVs.The results showed that emissions from China-6 LDVs were significantly lower than those from China-5 LDVs in terms of total hydrocarbon emissions and diurnal losses over 0–24 h,with lower variability.In the second group,seven petrol fuel samples with varying aromatic formulations,ethanol contents,and vapour pressures were tested.Evaporative emissions and refuelling emissions were measured following China-6 procedures,while speciated VOCs were also quantified.The results showed that higher molecular weight aromatics more effectively suppressed evaporative emissions than toluene.Both E5 and E10 fuels increased vapour leakage during the diurnal-loss stage.Diurnal loss and refuelling emissions increased significantly with rising fuel Reid vapor pressure,particularly after the canister breakthrough on the second day.Speciated VOC analysis revealed that light alkanes dominated the escaped fuel vapour. 展开更多
关键词 Evaporative emissions Ethanol content Aromatic hydrocarbons Volatile organic compounds China-6 LDVs Ozone formation potential
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Free radical mechanisms of halogen coexistence promoting pollutants formation 认领 引用 被引量：1
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作者 Mingxuan Wang Shuting Liu +5 位作者 Linjun Qin Qingyu Guo Guorui Liu Dong Cao Lili Yang Minghui Zheng 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2026年第2期559-568,共10页
Halogens are common in industrial thermal processes and can induce formation of toxic organic pollutants.Currently,the specific effects of coexisting halogens on toxic pollutant formation are unclear.In this study,we ... Halogens are common in industrial thermal processes and can induce formation of toxic organic pollutants.Currently,the specific effects of coexisting halogens on toxic pollutant formation are unclear.In this study,we found the boosting effects of halogens on organic pollutants formation during thermal processes.In situ electron paramagnetic resonance spectroscopy was used to distinguish the organic free radical intermediates of organic pollutants during thermal processes.The pure chlorine-containing reaction system dominantly induce the formation of highly chlorinated phenoxy radicals,whereas the pure bromine-containing reaction system induce the formation of semiquinone radicals.The results provide clear evidence for the molecular mechanisms by which halogen coexistence boosts pollutants formation.Coexisting halogens made the reactions much more complex.Bromine atom radicals(Br·)can enhance the level of active chlorine atoms radicals(Cl·),then(1)facilitating highly chlorinated organic radicals and toxic pollutants formation,(2)activating polycyclic aromatic hydrocarbons molecules for subsequent ring growth and(3)accelerating oxidation reactions.Combining the identification of organic free radical intermediates and characteristics of products,detailed mechanisms of halogens on the formations of organic pollutants during thermal-related processes were clarified,which can be helpful for their efficient control in the widespread bromines and chlorines co-existence reaction system. 展开更多
关键词 Halogenated compounds Organic free radical intermediates Halogen coexistence Thermal process Fourier transform ion cyclotron resonance mass spectrometry
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Prolonged seasons of compound heat-humidity extremes amplify vulnerable population exposure in eastern China 认领 引用 被引量：1
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作者 Miaoni Gao Xinyue Sun +3 位作者 Buda Su Lu Tang Xingyu Cheng Tong Jiang 《Atmospheric and Oceanic Science Letters》 CAS CSCD 2026年第3期58-63,共6页
Compound heat–humidity extremes(CTHEs)pose escalating threats to human health,particularly for vulnerable populations(children and elderly)with limited physiological adaptability.This study reveals the expansion of C... Compound heat–humidity extremes(CTHEs)pose escalating threats to human health,particularly for vulnerable populations(children and elderly)with limited physiological adaptability.This study reveals the expansion of CTHE-active seasons across eastern China from 1961 to 2022.Southern China(SC)and the Yangtze–Huaihe region(YH)exhibit earlier onsets and delayed terminations,prolonging hazardous CTHE seasons by one month post-2015 in SC.The prolonged CTHE-active seasons,coupled with population growth,have driven sharp increases in exposure across eastern China,with annual CTHE and hazardous CTHE exposure increasing by 106 million and 78 million person-days since the 2000s.Vulnerable groups constitute 39%of total exposure,with 11%(CTHEs)and 34%(hazardous CTHEs)attributable to season prolongation.Mechanistically,an intensified and westward-extended western North Pacific subtropical high enhances diabatic heating and moisture advection,driving prolonged CTHE-active seasons in SC and YH.These findings quantify climate–demographic synergies in heat–health risks,providing a scientific basis for climate-resilient health strategies targeting age-sensitive populations in eastern China’s warming and humidifying hotspots. 展开更多
关键词 Compound heat-humidity extremes Onset and termination Western north Pacific subtropical high Vulnerable population exposure
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Characteristics of super drought in Southwest China and the associated compounding effect of multiscalar anomalies 认领 引用 被引量：4
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作者 Lin WANG Wen CHEN +7 位作者 Gang HAUNG Ting WANG Qiulin WANG Xiaoyun SU Zixuan REN Chakrit CHOTAMONSAK Atsamon LIMSAKUL Kritanai TORSRI 《Science China Earth Sciences》 SCIE EI CAS CSCD 2024年第7期2084-2102,共19页
In recent decades,Southwest China(SWC)has suffered from frequent super droughts,leading to severe economic losses and ecological degradation.This study investigates the characteristics of super droughts in SWC during ... In recent decades,Southwest China(SWC)has suffered from frequent super droughts,leading to severe economic losses and ecological degradation.This study investigates the characteristics of super droughts in SWC during 1961-2022,reveals the compounding effect of multiscalar anomalies,and explores the plausible atmospheric circulation mechanisms responsible.The nature of super drought is a compound drought caused by the superposition of extreme drought events across multiple time scales.By contrasting the typical drought cases in 2006 and 2022,the decisive role of multiscalar drought compounding is confirmed.Based on the Comprehensive Multiscalar Index(CMI),multiple super drought events in SWC were identified to be temporally clustered during 2006-2014.Among them,the decadal background of enhanced evaporation and precipitation deficit at long time scales is a necessary condition for shaping the overall pattern of super droughts,while the precipitation and evaporation anomalies at short time scales trigger the outbreak of super droughts,determining the exact timing of occurrence.These events include August-September 2006,November 2009 to May 2010,July-October 2011,April-May 2012,January-April 2013,etc.Statistical results suggest that the contribution of superposed precipitation anomalies to super drought is 2.4 times that of evaporation.As regards the circulation mechanisms affecting multiscalar precipitation,the anomalous spatial patterns at short-term and long-term scales are similar,featuring the cyclonic circulation over the South China Sea and the northeasterly wind anomalies together with the subsidence center over SWC.During 2006-2014,the possible causes for the cross-seasonal persistent precipitation reduction in SWC are the extreme negative phase of the Pacific Decadal Oscillation(PDO)in the North Pacific as well as the pronounced warming of the warm pool in the western Pacific.The key dynamic processes are outlined as follows.On the one hand,the negative PDO phase generates anomalous anticyclonic circulation in the North Pacific,with the northeasterly winds on its southwest flank extending to Southeast Asia,hindering moisture transport into SWC.On the other hand,the warming of the warm pool excites anomalous cyclonic circulation to its northwest,also giving rise to northeasterly wind anomalies over SWC.Meanwhile,the ascending motion over the warm pool region diverges at upper levels with outflows converging aloft over SWC,which further induces compensating downward motion there.The combined effect of the above two remote forcings establishes a climatic background state unfavorable for precipitation over SWC at long time scales,thus constituting a crucial prerequisite for the superimposition of short-term precipitation anomalies to develop into super droughts. 展开更多
关键词 Super drought Multiscalar Compounding effect Mechanism analysis Southwest China
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Enhanced Superconductivity in Th2Mo2Ru2Si4C with a Collapsed Intergrowth Structure 认领 引用
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作者 Yun-Lei Sun Hua-Xun Li +10 位作者 Yi-Qiang Lin Liang-Wen Ji Chang-Chao Liu Jia-Yi Lu Wen-Lei Li Yi Liu Hao Jiang Ji-Yong Liu Yunhao Lu Yuke Li Guang-Han Cao 《Chinese Physics Letters》 SCIE EI CAS CSCD 2026年第3期270-282,共13页
We report the discovery of bulk superconductivity in a new quinary intermetallic compound Th2Mo2Ru2Si4C,crystallized in a collapsed 22241-type structure.This structure is characterized by the intergrowth o... We report the discovery of bulk superconductivity in a new quinary intermetallic compound Th2Mo2Ru2Si4C,crystallized in a collapsed 22241-type structure.This structure is characterized by the intergrowth of ThMo2Si2C and ThRu2Si2 units interconnected by equivalent Si-Si bonds that enhance inter-sublattice coupling.The refined lattice parameters are a=4.2212(1)Å and c=20.3899(7)Å.Electrical resistivity and magnetic susceptibility measurements of both polycrystalline and single-crystal samples consistently demonstrate bulk superconductivity with a transition temperature Tc∼6.0 K significantly higher than those of the constituent compound ThMo2Si2C and its related analogs.Under magnetic fields,the superconducting state exhibits a nearly isotropic behavior,which is attributed to strong covalent interlayer coupling.First-principles calculations reveal a substantial contribution from the Mo-d orbitals near the Fermi level,which exhibit several band-crossing points.The enhancement in Tc can be attributed to the synergistic combination of the valence electron concentration and the inter-sublattice self-doping effect between the[Ru2Si2]and[Mo2Si2C]layers. 展开更多
关键词 intermetallic compound superconductivity bulk superconductivity quinary intermetallic compound magnetic susceptibility measurements electrical resistivity Th Mo Ru Si C collapsed structure
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Synthesis,structure and physical properties of ternary Ce-based compound Ce3VAs5 认领 引用
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作者 B S Min L C Fu +11 位作者 X M Chen L C Shi H Y Zheng J Zhang J Song Z Deng J F Zhao L Duan C J Xiao J L Zhu X C Wang C Q Jin 《Chinese Physics B》 SCIE EI CAS CSCD 2026年第5期565-571,共7页
A new Ce-based compound Ce3VAs5has been synthesized at high-pressure and high-temperature conditions.The physical properties were investigated through the crystal structure,magnetism,electrical transport,and spe... A new Ce-based compound Ce3VAs5has been synthesized at high-pressure and high-temperature conditions.The physical properties were investigated through the crystal structure,magnetism,electrical transport,and specific heat measurements.The compound crystallizes in a hexagonal Hf5Sn3Cu-anti-type structure with the space group of P63/mcm,which consists of face-sharing octahedral VAs6chains and zig-zag like Ce-chains along the c axis.It undergoes a ferromagnetic-like ordering at TN=14 K due to the Ce-lattice,and exhibits heavy fermion behavior with a Sommerfeld coefficient ofγ~128 mJ/(Ce-mol·K2).The Kondo temperature TK is determined to be~19 K.The deviation of paramagnetic susceptibility from Curie-Weiss law is related to the crystal electric field(CEF)effects,and the abnormal drop in the resistivity is attributed to the synergistic interaction between CEF effect and Kondo scattering.Due to its quasi one-dimensional structure,Ce3VAs5provides a good opportunity to study the anisotropy relative to Kondo effect in the future. 展开更多
关键词 heavy fermion Kondo effect Ce-based compound antiferromagnetism
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The threshold effect of Ce-Zn compound pollution on maize roots:Implications for plant tolerance to combined metal pollution 认领 引用
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作者 Lei Wang Zhe Li +6 位作者 Dongdong Tuo Mingze Li Mengtong Guo Wenqian Zhang Xiaodong Wang Fuxin Hang Ying Zhang 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2026年第3期341-349,共9页
Heavy metal pollution is becoming increasingly severe,and rare earth elements(REEs)play a crucial role in influencing the environmental impact of heavy metals.Mixed heavy metal pollution presents a significant challen... Heavy metal pollution is becoming increasingly severe,and rare earth elements(REEs)play a crucial role in influencing the environmental impact of heavy metals.Mixed heavy metal pollution presents a significant challenge due to its complex effects.While many studies have focused on single heavy metal pollution,relatively few have examined the pollution caused by rare earth-heavy metal composites.This study investigated the toxic effects of Ce-Zn compound pollution on maize roots and used the integrated biomarker response(IBR)to assess the toxicity of different concentrations of Ce-Zn compound pollution on maize roots.The results showed that Ce-Zn compound pollution had a threshold effect:promoting maize growth at low concentrations but inhibiting growth at a threshold concentration of Ce 50 mg/kg-Zn 50 mg/kg.Ce-Zn compound pollution-induced oxidative stress in maize.When the pollution concentration exceeded the threshold,the H2O2content in maize roots increased by 3.30 and 3.56 times,respectively,compared to the CK group,while the O2-content increased by 1.45 and1.48 times,respectively.Cell structure damage was observed,and the levels of antioxidant enzymes—peroxidase(POD),catalase(CAT),and superoxide dismutase(SOD)—in maize roots gradually increased.At low concentrations,the Ca2+absorption rate in maize roots increased by 82.99%compared to CK.By regulating the Ca2+concentration,the absorption of H+and other ions was affected,enhancing intracellular enzyme activity and improving the tolerance of maize roots to compound pollution.These findings enhance our understanding of the harmful effects of combined pollution from rare earth metals and heavy metals on plants. 展开更多
关键词 Ce Zn Toxic effects Compound pollution Tolerance
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